/*
** client.c -- a stream socket client demo. Original by Beej, patched by ntrna.
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>

#include "idl.h"


// get sockaddr, IPv4 or IPv6:
void *get_in_addr(struct sockaddr *sa)
{
    if (sa->sa_family == AF_INET) {
        return &(((struct sockaddr_in*)sa)->sin_addr);
    }
    return &(((struct sockaddr_in6*)sa)->sin6_addr);
}

int main(int argc, char *argv[])
{
    int sockfd, numbytes;
    struct SNetData buf; // Input parameters that are going to be sent by client to the server.
    float  fRes = 0.0; // float to hold result calculated by server.
    struct addrinfo hints, *servinfo, *p;
    int rv;
    char s[INET6_ADDRSTRLEN];

    if (argc != 2) {
        fprintf(stderr,"usage: client hostname\n");
        exit(1);
    }

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;

    if ((rv = getaddrinfo(argv[1], PORT, &hints, &servinfo)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        return 1;
    }

    // loop through all the results and connect to the first we can
    for(p = servinfo; p != NULL; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype,
                             p->ai_protocol)) == -1) {
            perror("client: socket");
            continue;
        }

        if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("client: connect");
            continue;
        }

        break;

    } // for

    if (p == NULL) {
        fprintf(stderr, "client: failed to connect\n");
        return 2;
    }

    inet_ntop(p->ai_family, get_in_addr((struct sockaddr *)p->ai_addr),
              s, sizeof s);
    printf("client: connecting to %s\n", s);
    freeaddrinfo(servinfo); // all done with this structure

    buf.fA = 24.0;
    buf.fB = 3.0;
    buf.nST = 1; // Sleep 1s.

    if (send( sockfd, &buf, sizeof buf, 0) != sizeof buf)
        perror("processClientRequest() send result problem");

    if ((numbytes = recv(sockfd, &fRes, sizeof fRes, 0)) != sizeof fRes) {
        perror("recv");

        exit(1);
    }

    printf("client: received '%f'\n", fRes );

    close(sockfd);

    return 0;

} // main()
